Controlling device for power punching-machines



3 Sheets-Shet 2,

(No Model.)

. G. L. STUEBNER.

CONTROLLING DEVICE FOR VPOWER PUNGHING MACHINES;

No. 548,017. Patented 001;. 15, 1895.

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INVENTQH WITNESSES.-

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3 Sheets-Sheet 3.

(No Model.)

G.L.STUEBNER. vCONTROLLING DEVICE FOR POWER PUNGHING MACHINES.

Patented Oct. 15

. VI B A TTOHNE Y S.

WITNESSES:

Mv PHOTO-LIMO- WASKINGTUNJJL NITE STATESv GUSTAVUS L. STUEBNER, OF LONGISLAND CITY, NEW YORK.

CONTROLLING DEVICE FOR POWER PUNCHlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 548,017, dated October15, 1895.

Application filed February 16 1895. Serial No. 638,707- (No model.)

To all whom it may concern:

Beit known that I, GUsTAVUs L. STUEBNER, of Long Island City, in thecounty of Queens and State of New York, have invented a new and ImprovedControlling Device for Power Punching-Machines, of which the followingis a full, clear, and exact description.

My invention relates to a controlling device for powerpunching-machines, the object of the invention being 'to so constructthe said device that when once it has been set the punch, beforeentering the article to be operated upon, will approach .said article'asclosely as possible without contacting therewith, in order that theoperator may ascertain whether the punch is properly centered, andwhereby, also, when the punch approaches the article, as above setforth, the drivingmechanism of the punch will be thrown outof gear withthe power-applying mechanism, and whereby, further, upon throwing thepunch-controlling mechanism into gear with the power-conveyingmechanism, the punch will continue on its downward passage to punch themetal and return therefrom in the usual manner.

The invention consists in the novel construction and combination of theseveral parts, as will be hereinafter fully set forth, and pointed outin the claims. I Reference is to be had to the accompanying drawings,forming a part of this specification, in which similar figures andletters of reference indicate corresponding parts inall the views.

Figure 1 is a side elevation of a powerpunch having the improvement 7applied thereto. Fig. 2 is a plan view of the punch and the saidcontrolling mechanism. Fig. 3 is a section taken substantially on theline 3 3 of Fig. 1. Fig. at is 'an end view of the punching-machine.Fig. 5 is a side elevation of the controlling-plate and clutch. Fig. 6is a front elevation of a shifting-fork used in connection withfrheclutch, the shifting-slide carried by the fork being in section. Fig. 7

is a side elevation of the shifting-slide used in connection with theshifting-fork. Fig. 8 is a plan view of the trip-shaft, which is adaptedto be mounted on the shifting-slide; and Fig. 9 is a face View of thecontrollingplate and clutch shown in Fig, 5.

I In carrying out the invention the shaft 10 of the punching-machine A,which communicates power to the punch-driving mechanism, is providedwith the usual power-pulley 11 at one end, and this pulley is providedwith a clutch-surface 12 upon its inner face, adapted for engagementwith a clutch B, which is mounted to slide upon and turn with thepower-shaft 10. This clutch, as shown in Figs. 5 and 9, comprises a body13, having an annular groove 14 therein, a flange 15, which is in thenature of a plate formed upon or attached to the body, and aclutch-surface 16, formed at the back of this plate for engagement withthat on the power-pulley 11. The flange or plate 15 is the primarycontrolling device of the aforesaid controlling mechanism, and to thatend it is provided with a number of apertures or openings 17, (shownbest in Fig. 9,) and adjacent each aperture a designation thereof isproduced on the plate, being a fraction or a whole number, andindicating a fraction of an inch, or one or a number of inches. In thedrawings the scale reads from one-eighth in eighths to one inch, sincethe plate so marked is adapted for use in punching metal from one-eighthof an inch to one inch in thickness.

A shifting-fork O is employed in connection with the clutch B, and thebody 18 of this fork at its center is pivotally attached to a stud orprojection 19 on the back of the frame of the machine, as shown inFig. 1. This shiftingfork carries upon each of its members a segmentalblock 20, the concaved surfaces of the blocks being made to face oneanother, and said blocks are of such size that they will freely enterthe groove or channel 14: in the .body of the clutch. These blocks areheld in position in the members of the fork by means of set-screws orpivot-pins 21 or their equivalents, and the fork is adapted for movingthe clutch laterally on the powershaft.

A shifting-slide 22 (shown in detail in Fig. 7) is pivotally connectedat its rear end with the shifting-fork, and this shifting-slide isprovided near its rear end with a downwardly-extending arm 22", havingan outwardly-extending foot at its lower end. The slide 22 haslongitudinal movement in suitable guide-straps 23, secured upon one sideof the frame A of the punching-machine, and tension is constantlyexerted on the slide in direction of that end of the frame at whichpressed downward, the slide will be forced.

rearward, placing the spring 25 under tension.

A trip-shaft 29 is mounted in bearings 30, formed upon the outer face ofthe slide 22 near its rear end. This trip-shaftis provided with threearms 31, 33, and 35, placed at angles to one another. The arm 31, whichis the foremost arm, is adapted to be used as a latch, and when theslide 22 is pressed backward will engage with a keeper 32, secured uponthe frame, the said keeper being ordinarily a channeled or shoulderedblock. The intermedate arm 33 extends horizontally outward from theshaft and is connected by a spring 34 with the foot of the arm 22,forming a portion of the slide 22, while the third arm 35 of the saidtrip'shaft extends inward in front of the controlling plate or flange 15of the chuck B and is adapted to be tripped or forced outward by contactwith a pin 36, which is placed in one of the scaled openings 17 in thesaid controlling-plate.

In the operation of the attachment, when the punch has an inch throw thecontrollingplate is scaled, as shown in Fig. 9. Supposing a bar of metalis to be punched with a number of holes and the said bar of metal isseven-eighths of an inch thick, the pin will be placed in thecontrolling-plate opening marked seven-eighths. The slide 22 is thenforced rearward, causing the shifting-fork to place the clutch B indriving connection with the power-wheel 11, if such a contacthad notpreviously been made. The driving-shaft will now be rotated, and atabout the time the punch has moved one-eighth of its full throw the pinin the controlling-plate will have struck the rear arm of thetrip-shaft, as shown in Fig. 3, and in passing the arm will rock theshaft outward, carrying the latch-arm 31 of that shaft out of engagementwith its keeper 32 and releasing the slide 22, whereupon its spring 25will immediately draw the slide forward and disconnect the clutch fromthe driving-pulley, stopping the machine. The punch will now be over themetal and close thereto, and the operator may readily determine whetheror not the punch is properly centered. i Thereafter during eachrevolution of the shaft the punch will have passed through the metal andwill be stopped by the trip device in the position it started-namely,close to the bar operated upon. After each punching operation themachine isthrown in gear by the lever 27.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In a controlling device for power punches, thecombination with a punch operating shaft, and a clutch carried thereby,of a spring pressed clutch shifting slide, a latch carried by the slideand engaging a fixed keeper on the frame for locking the slide againstthe tension of its spring, and intermediate mechanism between the latchand clutch for releasing the former from the latter, substantially asdescribed.

2. In acontrolling device for power punches, the combination with thepunch operating shaft, and a clutch carried thereby, of aspring pressedclutch shifting slide, a spring pressed latch carried by the slide andeugagin g a fixed keeper on the frame for locking the slide against thetension of its spring, an arm carried by the latch, and an adjustablepin carried by the clutch and adapted to engage the arm of the latch,substantially as described.

3. In a controlling device forpower punches, the combination with thedriving shaft of the punch, the power pulley, and a clutch carried bythe driving shaft and adapted for frictional contact with the drivingpulley, of a movable trip located on the said clutch, a slide, a tensiondevice connected with the slide, a latch adapted to hold the slideagainst the tension device, a shifting connection between the slide andclutch, and a rocker arm connected with the latch and operated from thesaid movable trip, as and for the purpose specified.

4. In acontrolling device for power punches, the combination, with apunch, a driving shaft controlling the same, a driving wheel, and aclutch mounted to slide upon and turn with the power shaft and adaptedfor frictional engagement with the power wheel, of a trip adjustablylocated on the clutch, a springcontrolled shifting slide, a shifting armconnected with the said slide and having bearing upon the clutch, a rockshaft provided with an arm for engagement with the said trip, alatch,aud a keeper adapted to be engaged by the latch and disconnectedtherefrom by the aforesaid arm engaging with the trip, as and for thepurpose specified.

5. In acontrolling device for power punches, the combination, with thepower shaft controlling the punch, a power-communicating mechanism, aclutch revolved by and held to slide upon the said shaft, adapted forfrictional engagement with the power-communieating mechanism, a flangeformed upon the disk, having a series of openings therein, and

a stud loosely fitted in one of the said open-' ings, of aspring-controlled slide, a shifting lever connected with the slide,adapted to operate it in one direction, one portion of the said slidebeing in shifting engagement with the said clutch, a trip shaft mountedupon the slide and provided with a forwardly-extending arm forengagement with the trip stud, and a latch adapted for engagement with afixed keeper, and a tension device exerting tension on the said shaft ina direction to hold the arm thereof in the path of the aforesaid tripstud, as and for the purpose set forth.

6. In acontrolling devicefor power punches, the combination, with thedrive shaft thereof, a pulley loosely mounted thereon and having aclutch face, a clutch adapted for engagement with said pulley andprovided with a flange having a series of apertures therein,

and a trip stud located in one of the said apertures, of a slide, ashifting arm fulcruined on a fixed support, connected with the slide andhaving engagement with the clutch, a trip shaft mounted on the saidslide, provided Wltll a trip arm for engagement with the trip stud ofthe clutch, and a latch adapted for engagement with'a fixed keeper, atension device exerting tension on the said trip shaft in a direction tohold its trip arm in the path of the said stud, a tension mechanismoperating upon the slide in a direction away from the clutch, and ashiftinglever connected With said slide, substantially as described.

GUSTAVUS L. STUEBNER.

Witnesses:

J. FRED; ACKER, J NO. M. BITTER.

